SOLUTION: There are currently 50 million cars in a certain country, decreasing by 4.9% annually. How many years will it take for this country to have 27 million cars? Round to the nearest ye

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Question 144261: There are currently 50 million cars in a certain country, decreasing by 4.9% annually. How many years will it take for this country to have 27 million cars? Round to the nearest year.
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
There are currently 50 million cars in a certain country, decreasing by 4.9% annually. How many years will it take for this country to have 27 million cars? Round to the nearest year.
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A(t) = Ao(1-0.049)^t
27 mil = 50 mil (0.951)^t
0.951^t = (27/50)
t[log0.951] = log[27/50]
t = 12.264 years
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Cheers,
Stan H.